2 * Performance event callchain support - SuperH architecture code
4 * Copyright (C) 2009 Paul Mundt
6 * This file is subject to the terms and conditions of the GNU General Public
7 * License. See the file "COPYING" in the main directory of this archive
10 #include <linux/kernel.h>
11 #include <linux/sched.h>
12 #include <linux/perf_event.h>
13 #include <linux/percpu.h>
14 #include <asm/unwinder.h>
15 #include <asm/ptrace.h>
17 static inline void callchain_store(struct perf_callchain_entry *entry, u64 ip)
19 if (entry->nr < PERF_MAX_STACK_DEPTH)
20 entry->ip[entry->nr++] = ip;
23 static void callchain_warning(void *data, char *msg)
28 callchain_warning_symbol(void *data, char *msg, unsigned long symbol)
32 static int callchain_stack(void *data, char *name)
37 static void callchain_address(void *data, unsigned long addr, int reliable)
39 struct perf_callchain_entry *entry = data;
42 callchain_store(entry, addr);
45 static const struct stacktrace_ops callchain_ops = {
46 .warning = callchain_warning,
47 .warning_symbol = callchain_warning_symbol,
48 .stack = callchain_stack,
49 .address = callchain_address,
53 perf_callchain_kernel(struct pt_regs *regs, struct perf_callchain_entry *entry)
55 callchain_store(entry, PERF_CONTEXT_KERNEL);
56 callchain_store(entry, regs->pc);
58 unwind_stack(NULL, regs, NULL, &callchain_ops, entry);
62 perf_do_callchain(struct pt_regs *regs, struct perf_callchain_entry *entry)
69 is_user = user_mode(regs);
71 if (is_user && current->state != TASK_RUNNING)
75 * Only the kernel side is implemented for now.
78 perf_callchain_kernel(regs, entry);
82 * No need for separate IRQ and NMI entries.
84 static DEFINE_PER_CPU(struct perf_callchain_entry, callchain);
86 struct perf_callchain_entry *perf_callchain(struct pt_regs *regs)
88 struct perf_callchain_entry *entry = &__get_cpu_var(callchain);
92 perf_do_callchain(regs, entry);